Mechanisms underlying maternal venous adaptation in pregnancy.

Mechanisms underlying maternal venous adaptation in pregnancy.
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DOI:
10.1177/1933719109332820
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发表时间:
2009-06
期刊:
Reproductive sciences (Thousand Oaks, Calif.)
影响因子:
--
通讯作者:
Osol G
Osol G
中科院分区:
其他
文献类型:
--
作者:
Wedel Jones C;Mandala M;Barron C;Bernstein I;Osol G

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To define the effects of pregnancy on mechanical properties and reactivity, mesenteric veins from late pregnant (LP) and virgin control (NP) rats were pressurized to determine gestational changes in size and distensibility. Reactivity studies used an adrenergic constrictor (norepinephrine, NE) and an endothelium-mediated vasodilator (acetylcholine, ACh). The contribution of nitric oxide (NO) to endothelial function was evaluated with pharmacologic inhibition of NO synthase. Roles of NO and cGMP in smooth muscle vasodilation were determined by using an NO donor with and without cGMP inhibition using ODQ, a selective inhibitor of guanylyl cyclase. In pregnancy, endothelium-dependent vasodilation markedly increased (largely due to endogenous NO), smooth muscle response to NO decreased (primarily related to cGMP production), and NE sensitivity decreased considerably, with no changes in vessel size or distensibility. Our results identify a pro-vasodilatory state in the systemic venous system which would serve to facilitate the accommodation to plasma volume expansion requisite for normal pregnancy.
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